APA Citation

 Proakis, J. G. (2014).  Digital Signal Processing.  Pearson Education, Inc.

Chicago Style Citation

 Proakis, John G.  Digital Signal Processing.  Pearson Education, Inc, 2014.

MLA Citation

 Proakis, John G.  Digital Signal Processing.  Pearson Education, Inc, 2014.

Warning: These citations may not always be 100% accurate.